And what does that mean ?

Technology is our future. And we use it in our everyday lives. 3-d printing is used to make fast products like artificial body parts for people in need. but also they can be used for weapons.

WHAT IS THE FOURTH AMENDMENT ?

"The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause."

what!?

If law enforcement wants to search your property for evidence. And you don't let them in. They would have to get a search warrant. And show to the court that it is for probable cause.